Exterior of Road-Haus by Wheelhaus.

This 250-Square-Foot Prefab Cabin Fits a Queen Bed and a Fireplace12/15

"At Wheelhaus, our priorities are durability, efficient use of space, and sustainability—and we provide all of that along with modern and innovative design," says Mackay. "We focus on energy efficiency, progressive space management, and top-of-the-line building materials."